Kyle Sanders's Page

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"wow.. that's a great idea about the balloon carrying the glider, etc!
the balloon would just take the glider very far away and pretty high, then
the glider would free itself and glide back home taking pics on the way back...
that would fix the…"

"A multiplexer (MUX) takes eight inputs in A/B form and switches between them for the output. So S1A and S1B refer to RC vs Autopilot, and the MUX (directed by the Attiny) decides which one gets to control Out 1."

"Thanks for all that explanation, Chris. It was not immediately obvious to me, in this part of the ArduPilot diagram around the 74LS157D chip, that S1B (pin3) is to be interpreted as an input which is linked in the chip to 1Y (pin4) output, itself…"

"It's pretty straightforward. Look at the schematic and you'll see that
S1B (which goes to pin 13 on the Atmega) -> Out 1
S2B (pin 14) -> Out 2
Then go to the Arduino pin mapping diagram to see how those physical pins related to…"

"Chris, good you link to the schematic here, but as a newbie i am sorry to admit I do not know how I could for example infer from them that ArduPilot servo OUT1 is accessed by programming the D9 pin in the Arduino environment. The 74LS157D…"